<div class="row scroll">
  <div class="box">
    <x-affix top="0">
      <x-button>滚动条下滑，我将固定到顶部</x-button>
    </x-affix>
    <x-affix [style.margin-left.rem]="1" top="5rem">
      <x-button>滚动条下滑，我与顶部距离5rem</x-button>
    </x-affix>
  </div>
</div>
